Diabetes is a condition that causes your blood sugar to be consistently high. This can damage your blood vessels, including those that supply the light-sensitive tissue at the back of your eyes (retina), which is essential for your eyesight. The damaged blood vessels can become swollen, leak fluid or bleed, all of which damage your retina — this is diabetic retinopathy and usually affects both eyes.
If left untreated, diabetic retinopathy can eventually lead to blindness — around 1,600 people every year in the UK lose their eyesight due to diabetic retinopathy. However, this condition usually develops gradually over time and can be managed to avoid blindness by having regular eye tests to spot problems early and learning to control your blood sugar levels.
Too much sugar in your blood over time can block the tiny blood vessels that supply your retina. In an attempt to restore blood flow, your eye grows new blood vessels but they don’t develop properly and can swell, leak and bleed, damaging your retina.
As diabetic retinopathy worsens, more of the blood vessels supplying your retina become blocked, causing more scar tissue and new blood vessels to form. Together, this can cause your retina to detach or tear. Diabetic retinopathy also increases your risk of other eye conditions, including glaucoma and cataracts.
You probably won’t be able to tell in the early stages of the condition, which is why it’s important to go for regular diabetic eye screenings. Early detection and treatment can help stop it getting worse.
See your GP or diabetes care team immediately if:
These symptoms don’t necessarily mean you have diabetic retinopathy but you need to have your eyes checked for this and other sight-threatening conditions.
Everyone with diabetes who is aged 12 or older should be screened each year for diabetic retinopathy.
During retinal screening, you’ll be given eye drops to enlarge your pupils, then photographs of your retina will be taken and sent away for analysis and diagnosis. Your doctor will look for changes in the blood vessels supplying your retina, including new blood vessels.
If you’re diagnosed with diabetic retinopathy, it will be graded according to how far it’s progressed.
There are four stages of diabetic retinopathy:
Mild nonproliferative retinopathy
There are changes in the tiny blood vessels that supply your retina, specifically small bulges in these vessels called microaneurysms. Fluid can leak out of these microaneurysms.
Moderate nonproliferative retinopathy
Blood vessels that supply your retina become swollen and change shape, reducing their ability to effectively deliver blood to your retina. This can cause changes in the appearance of your retina.
Severe nonproliferative retinopathy
Many of the blood vessels that supply your retina are blocked and can't supply blood to your retina. Parts of your retina that don't receive a healthy blood supply start to grow new blood vessels.
Proliferative diabetic retinopathy (PDR)
New blood vessels, which developed in response to the lack of a healthy blood supply to your retina, don't grow properly, passing into the retina and then into the jelly-like substance (vitreous body) that fills your eyeballs. These new blood vessels are more likely to leak fluid and bleed, causing scar tissue to form. Together, this can cause the retina to tear or detach from the underlying tissue — retinal detachment can cause permanent blindness.
Treatment will depend on the stage and grading of your condition.
Controlling your diabetes can prevent or delay your condition getting worse, especially in the early stages. You should:
If your diabetic retinopathy is more advanced you may be offered:
Can diabetic retinopathy go away?
No, diabetic retinopathy doesn’t go away and can’t be reversed. However, it doesn’t have to lead to blindness. Managing your diabetes and treating your diabetic retinopathy can limit sight-threatening damage to your eyes.
Can diabetic retinopathy be corrected?
No, diabetic retinopathy can’t be corrected. However, there are treatments to limit its damage. Most importantly, managing your diabetes to keep your blood sugar levels within a healthy range will help prevent your diabetic retinopathy worsening.
How long does it take to go blind from diabetic retinopathy?
Diabetic retinopathy develops gradually, usually taking years before symptoms that affect your vision occur. Left untreated, this can lead to blindness over several years. However, going blind from diabetic retinopathy isn’t inevitable if you get treatment and manage your diabetes.
Is diabetic retinopathy considered a disability?
If your diabetic retinopathy has reduced your vision significantly, you may qualify as disabled. Under the Equality Act, diabetes is classed as an unseen disability.